Core construction for electrical apparatus.



G. L. AINGLAND.

CORE CONSTRUCTION FDH ELECTRICAL APPARATUS.

APPLscATloN msu FEB. 19. |911.

i All lillllillll llll Hill! UNITED STATES PATENT OFFICE.

Groen fr.. amera-ND; onnonwoon; omo, AssIGNoR'fTo 'ALLIs-CHTALMERS- MANFAC- TURINGcoMP/ANY, OFMILWAUKEm-WISCONSIN; A CORPORATION or DELAWARE."

CORE CONSTRUCTION FOR ELECTRICAL APPARATUS.

Specification of Letters Patent.

T0 'all whom'zt Vmt] concern Be itknoivn that'LGriRG L. RIQNGLAND? a citizenfof the UnitedStates, residing at Norwood; in thef county of Hamilton andState ofOhio, have inv'e'i'ite'd a certain new and use fuIf Improvement in 'Core Constructions for Electr'calJ apparatus,`I of' wliich-`r the follow'- ing'js 1 "speeifcfation A A Thisinve'ntidn relates" in general to 'elec tric'alappara'tus 'and 'particular' relation to means for' 'promoting'etlieientventilation of 'the "cores' of "such "apparatusivhile 'nifii'n '1 tain-ing mechanically strong fand'durable coref construction."

In the cores'pfelectr'mal apparatus' it is customary'to 'provide' passages' for the 'now of'i/entilating iiiid forthe 'purpose' of'm'ainsuitable retaining' means,-'the laminations heingasse'rnbled in'groupsspace'd apart, the

spaces'.'providi'ng passages for the i'lo'iv of Various means-have l Ventilating currents. been 'utilized'to "maintain the' core parts properly "sp'a'c'ed-"one' "from" another and to provide the desired Ventilating passageways fonmainta'ining tHe-core and the' Wind ings 'associated therewith in la 'cool"and'efficient satisfactory results'-have been attained with certain prior art' "constructions, nevertheless,

these results,'rvhat`ever` they mayv be.' have been secured only at"c0mparatively great expense, these prior art spacing devices' bemg'of 'more or less'special shapes 'and requi'ring'fspecial4 means for the attachment thereof,"the' same involving high 'cost' both for' providing 'th'ese devices' and for attachingthemin operative position.

In`acc'rdanc'e with this invention, in -its prefer1ed form, the-devices used for'spa'cing apart'adjaeent'- sections of the core are in the`- forinlot'ordinary tinners rivets having a shank Jp Gi"t"1 "o'Ii'and an enlarged 'head at one end'of'the shank portion. The 'heads ofthe rivets are-,attached to the end laminations `offon'e' o r `bot h"f` the 'spaced'groups', bei-ngA 'secii'red 'f' thereto by "an autogenous union,

preferably through "an 'electric Weld' 'which can' be' 'i'fe'ry'-- expeditiously made', the lattachment""`being preferably'at a plurality of points'spaced from vand'syn'imetri'cally dis- .vith`a minimum Weight ofmateri'al and at i a comparatively small cos'tl'" It is an object 'of this invention "to provide improved means for spacing sections of a core ofelectrical' a1'ip"1xatus,l v'Whichfm'cans' caribe 'readily' ,and cheaply' provided andassembled."`ancl' Vwhich''provides 'for vthe required 'mechanical strength 'and-the 'eicient y ventilation'of'the core.

It is a'further 'and more's'pe'cific object of' Patenfed'bec. 3,1918.

this'invention to 'provide an improved means for .spacing and' holding in operative posi!" tion "the 'sections 'of' a coi-' "of "electrical apparatus. thisA means involving' the 'use' of va plurality o'se'parate spacing 'clcmentsin 'the generali'ormpt' lieaded'rivet's'. thefheads of the rivets' being integra'ilv united to one of the" c or'e 'sections-at Aa plurality otpoints' radially outside of the axis'of t1ie`rii'et,'and the other 'end's of the rivets' abutting against the other 'one of the spaced core sections.

These and other objects 'are' 'attained by this" invention, the various novel 'features' of which'will appear from the description anddrai'vings, disclosing one embodiment ot such invention. and 'will' be particularlypointed out. in the'claims.

In the vaccom'p'ai'iying drawings:

Figure'l is a radial sectional view throughv a fragment of the rotor core loi a dynamoelectric machine embodying features of this inventiom'the section being taken along the Fig.'2 is a fiagmenta'ry'fplan view of the core shownin part in Fig.V l.

Fig. B isan enlarged fragmentary sectional view along the line III-III of Fig.Y

2. alongwith apparatus, shown conventionally, for securing one of the spacing devices to a lamination.

Fig. 4 is a view similar to Fig, l, showing a -modified arrangement of the several Spacing devices attached-'to 'an vend laminai tion 'of a core section.

In'the' embodiment ofthe invention illusl trat'ed, a core 10 'of the'rot'atable element of a dynamo-electric machine is shownmounted on a spider o r other support 11. posed ab'dt'the axi'sof the"riv'etand radi'- T he' core is divided'into` a'plu'rality of spaced plish the successive' welding of several' sections, being here-shown as made up of a plurality of laminations, laminations of two sections being designated as 12 and 13, respectively, andthe space between the core sections being designated as 14. This space 14 .provides a -passage for Ventilating currents which, by contact with the heated surfaces ofthe core. sections, maintain the core in a operating condition.

T hespacel between thecore sections is provided during the assembling' ofthe core on the spider 11, spacing devices 15 between the end laminationsj '12an3d 1 1?) serving to effectively maintain the'l sections vin such spaced relation. As shown, these spacing devices 15 arey in the formof ordinary iron or soft steel' tinners rivets comprising a shanl; portion 16 Iand an .enlarged head 17 which is attached to the 'lamination 13 with the shank portioneftending axially of the machine. T he'se' rivets'or spacing devices are attached to Ithe lamination lp'referably before the same isasscmbled upon the spider,

the preferable mannerffffI attaching the same' being throughan au'togen'ous union, as by electrically welding'the head portion of the rivet tothe laminatiomthe weldlo'r area fof attachment of the rivetbeing! preferably at a plurality ofpoints symmetrically arranged .aboutjtheaxis of the; rivet' or v'along an fannularY surface .radially o'ntside of the I shank portion of the"rive t as generallyshown 4at 18 in Figf '.fIn' attaching the rivets, a hollow electrode QLliaving its welding surface annular infshape and fitting over the shank` 16 ofthe Irivet, lengages the inner side of tbefheadglf'g', 'theputer side of the.l headlabutting againstfoi'ie fside'v ofthe lamination 13, and an ,f electrode'' 23 whose contact surface'v is preferably@ of substantially thesanie araasthatof the electrode 21"en'gages'the oppositesidexpf the lamina tion 13. TheV electrodes arefconnected toa suitable sourc'eof welding current to produce a weldingheat at the requiredpoints on the surfaces to be welded,`and the reqt'iired-degres of pressure -is'-I then applied` as in the ordinary welding operation. Most eXpeditions welding and generally satisfactory lre- `sults are attainedifan automatic feeding device is associateduiwithfthe electrode 21 whereby the rivetsare'automatically moved into operative position tqbe'j'welded as the. electrodes or' the work are'shiftedto accomrivets to the lamination. The nuinber. and relative arrangement of the'rivet's or spacin'gldeyices may be'anyf thing desired to provide for .the lproper me-v chanical strength to resist cori ipressior 15r ,be-

tween the spaced sections, two relative Tarrangemen'ts beingv lshown in Figs.' and 4, that of Fig. 1 beuig one wherein the spacing devices are vin substantially' radial alinement` the opposing end comparatively cool and that ofu'Fig. 4 being-one whereinthe rivets are somewhat staggered radially.

By using spacing devices of: the character" struction oii'ered by the rivet to the flow of Ventilating currents is through the shank portion thereof, and this/need be onlyof such size, as, with a suitable number there# of, sufficient strength isprovided to resist axial' approach of the spaced sections when thev core is assembled. By attaching the rivet to an end lamination at a plurality of points spaced from and substantially symmetricallydisposed about the axis ofthe rivet, or, as shown, alongan annular surface radially outside of the shankportion of the rivet, instead of merely along the axis or wholly at one side thereof, it will be appar ent that maximum resistance 1s afforded againstseparation of the rivet' from the lamination as mighthe causedby aforce vapplied to the'shank portion in a direction transverse to the axis thereof. In fact, with Ithe'arrangement described, attempts to remove the attached rivet from the lamina` tion result only in 'severing the portion Vof the Vlamination attached tothe rivet from the body'portion of the lamination, there beingno indication ofanyseparation along l 'the welded area.

It will be apparentv that, instead of attachl ing all ofthe spacing devices to one 'lamina-A tion, 'such as 13, aportion of the spacing vdevices mav be atta-"hed to the opposed larnination, suchas 1Q', the rivets extending in opposite directions and the outer ends of the shank portions vbearing against `the other end lamination.

It should be understood that it is hot de,-y

sired that theinventioii vclaimed belimited to the exact details of construction showny and described for ob` \"ious modiicationswill occur to a person skilled' in` thejart. It isclaimed and desired 'to secure4 by Letters' Patent:

1 .1n a core'for' electrical apparatus, a

plurality of axially spaced' -sections,` 'and lation, said lmeans'comprising a plurality of spacing elements, each of said spacing ele- 2. In a core .for electrical apparatus, a plurality of; axially spaced sections, and

V12o mea-ns for holding said sections'in spaced rements including' a substantially cylindrical shanki againstl andatta'ched to' one'y of said'sections,

and the opposite end of said shank portion ias means for holding said sections in spaced relation and comprising a plurality of spacing elements, each of said spacing elements being in the form of a rivet having ay shank portion and an enlarged head, and said enlarged head bearing against and being attached to one of said sections at a plurality o points radially outside of the shank portion of said rivet.

3. In a core for electrical apparatus, a plurality of axially spaced sections, and means for holding said sections in spaced relation and comprising a plurality of spacing elements in the form of rivets, each of said rivets including a. shank portion and an enlarged head, and said enlarged head bearing against and being attached to one of said sections at a plurality or" points symmetrically disposed about and radially outside of the shank portion of said rivet.

4. In a cone tor electrical apparatus, a plurality of axially spaced sections, and means for holding said sections in spaced relation and comprising a plurality of spacing elements in the form of rivets, each of said rivets comprising a shank portion and an enlarged head, and said enlarged head being united to one of said sections by fusion of metal of thev parts at points symmetrically disposed about and radially outside of the shank portion of the rivet.

5. In a core for electrical apparatus, a plurality of axially spaced sections each oomprising a plurality of laminations, and means for holding said sections in spaced relation, said means comprising a plurality of spacing elements in the form of rivets, each of said rivets comprising a shank portion and an enlarged head, and said enlarged head being' united `to an end lamination of one section by fusion of metal of the head and said end lamination along annular sur faces thereof.

6. In a cone. for electrical apparatus, a lamination, and a plurality of spacing devices secured thereto, each of said spacing devices comprising a shank portion and an enlarged head at one end of said shank portion, and said head being attached to the Copies of this patent may be obtained for ve cents each, by addressing the r'ace of said lamination at a plurality of points radially outside of said shank portion and symmetrically disposed about the axisA of said shank portion.

7. In a core for electrical apparatus, a lamination, and a plurality ot spacing devices secured thereto each of said spacingdevices comprising a shank portion and an enlarged head at one end of said shank portion, and said head being integrally united to said lamination along an annular surface radially outside of said shank portion.

8. In a core for electrical apparatus, a lamination, and a plurality of spacing devices secured thereto, said spacing devices being in the form of rivets having a shank portion and an enlarged head at one end of said shank portion, and said head being integrally united to said lamination by fusion of metal of the parts at points symmetrically disposed about the axis of the shank portion and radially outside of said shank portion.

9. In combination in a core, a plurality of laminations, and means `for axially spacing said laminations, said spacing means comprising a plurality of spaced rivets each having a shank portion and an enlarged head, and said head being integrally united to one of said laminations by fusion of metal ofthe parts along an annular surface radially out side of the shank portion of the rivet.

l0. In a core for a dynamo-electric machine, a lamination, and a plurality of spacing devices secured thereto, each of said spacing devices having a longitudinal axis of symmetry parallel to the axis of rotation of said core and being autogenously united to said lamination at a plurality of points spaced from and symmetrically disposed about the axis of said spacing device.

ll. In a core for a dynamo-electric machine, a. lamination, and a spacing device secured thereto having a longitudinal axis of symmetry parallel to the axis of rotation of the core and being autogenously united to said lamination.

In testimony whereof, the signature of the inventor is ailixed hereto.

G. L. RINGLAND.

Commissioner of Patents,

Washington, D. C. 

